what is unconditional love???

According to the book Real Love, unconditional love is, in essence, true love -- so different from the kind of love most of us have known all our lives that it deserves a definition of its own. Unconditional love is caring about the happiness of another person without any thought for what we might get for ourselves.

Often we have heard fans saying Dev's love for Sona is unconditional or vice versa! Based on the above definition do you think their love is unconditional? ... do you think the prime characters of the show exhibit Unconditional love?

Is Ishwari's love towards Dev unconditional?

Bijoy's love for Sona?

What do you think?